Method apparatus and systems for producing and writing cipher keys, reproducing information with a cipher key, and for permitting reproduction of information with a cipher key, and permitting reproduction of information with a cipher key, and optical disc recorded with a cipher key

Abstract

Plural program information and a BCA (Burst Cutting Area) number of the optical disc 100 is previously recorded in the optical disc 100. A drive ID is stored in the nonvolatile memory 104a of the reproduction apparatus 104. A user of the reproduction apparatus 104 notifies the BCA number, the drive ID, and a number of preferred program information to the software house (software supplier) 110 on the condition that the user pays for the reproduction of the preferred program information recorded in the optical disc 100. The software house 110 notifies a cipher key to the reproduction apparatus 104 or the user. A title key is calculated in the reproduction apparatus 104 in accordance with the BCA number, the drive ID, and the cipher key. The preferred information recorded in the optical disc 100 is permitted to be reproduced by using the title key.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention is a divisional application of U.S. patent application Ser. No. 09 / 004,196 filed Jan. 1, 1998 which has issued as U.S. Pat. No. 6,097,814 and relates to a managing system of permitting reproduction of program information when the program information to be reproduced is recorded in an optical disc such as a CD (Compact Disc) or a DVD (Digital Video Disc or Digital Versatile Disc), particularly, and relates to improvements in a cipher key producing method, a cipher key writing method, a cipher key reproduction apparatus, an information reproduction method, an information reproduction permitting method, and a reproduction apparatus of optical disc so as to protect an optical disc from illegal utilization therof and illegal duplication or copy therefrom.[0003]2. Description of the Related Art[0004]In an optical disc package media such as a CD, all program information contained in an optical disc is dis...

AI Technical Summary

Benefits of technology

[0015]Accordingly, an object of the present invention is to provide a cipher key producing method suitable for easy management of the cipher key in conjunction with preventing from illegal utilization or duplication of program information.

Problems solved by technology

This causes a price boost of each of such discs.

On the other hand, as consumers prefer to purchase optical discs at lower prices, the above situation invites illegally duplicated optical discs sold at very low prices into the market.

The above mentioned distribution system 10 is not only unfavorable to the consumers but also increases cost and complexity of distribution for manufacturers and software houses.

Therefore it is impossible to utilize one cipher key for various optical discs or for several users.

On the other hand, a cipher key varies by program information, so that managing various cipher keys is rather difficult for a user.

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